Perhaps you should try some spelling variations:
"complementaridade constrained problemas" » "complementaridade contained problemas" (Expand Search)
"complementar constraints problemaasaticos" » "complementar constraints problematicos" (Expand Search), "complementar constraints problematicas" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("complementaridade constrained problemas") OR ("complementar constraints problemaasaticos"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problemas\") OR (\"complementar constraints problemaasaticos\"))*".
• Removing quotes may allow a broader search: (( complementaridade constrained problemas ) OR ( complementar constraints problemaasaticos ))*.